Abstract ： Research purposes ： In order to promote the development of suspended monorail system，the information of monorail operation lines abroad is summarized firstly, the primary type for track beam, pier and supported constraints of bridge structure for suspended monorail system is determined，and a suitable bridge structure of 30 m- span double - line simple beam for suspended monorail is presented finally. Research conclusions:( 1 ) According to the existing bridge structure features of suspended monorail abroad， considering the current situations in China, the cross section of track beam adopts large section, and the standard span is 30 m. (2) The pier structure for suspended monorail adopts T - type，the design radius and height of pier are 1.5m and 14 m respectively. ( 3 ) A suitable bridge model of 30 m - span double - line three - span simple beam for suspended monorail is supplied for the follow vibration analysis. The results show that the fundamental frequencies for transversal and vertical bending are 2.620 Hz and 5. 398 Hz. (3) The research shows that this 30 m - span bridge structure for suspended monorail system is reliable and suits the current situations in China，which provides a reference for the construction of suspended monorail transit system.